Variable-length quantity: Difference between revisions
Added Kotlin
m (→{{header|zkl}}: reformat) |
(Added Kotlin) |
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Line 863:
0x8000000 => [0xc0, 0x80, 0x80, 0x00] => 0x8000000
0xfffffff => [0xff, 0xff, 0xff, 0x7f] => 0xfffffff
</pre>
=={{header|Kotlin}}==
<lang scala>// version 1.0.6
fun Int.toOctets(): ByteArray {
var s = Integer.toBinaryString(this)
val r = s.length % 7
var z = s.length / 7
if (r > 0) {
z++
s = s.padStart(z * 7, '0')
}
s = Array<String>(z) { "1" + s.slice(it * 7 until (it + 1) * 7) }.joinToString("")
s = s.take(s.length - 8) + "0" + s.takeLast(7)
return ByteArray(z) { Integer.parseInt(s.slice(it * 8 until (it + 1) * 8), 2).toByte() }
}
fun ByteArray.fromOctets(): Int {
var s = ""
for (b in this) s += Integer.toBinaryString(b.toInt()).padStart(7, '0').takeLast(7)
return Integer.parseInt(s, 2)
}
fun main(args: Array<String>) {
val tests = intArrayOf(0x7f, 0x3fff, 0x200000, 0x1fffff)
for (test in tests) {
val ba = test.toOctets()
print("${"0x%x".format(test).padEnd(8)} -> ")
var s = ""
ba.forEach { s += "0x%02x ".format(it) }
println("${s.padEnd(20)} <- ${"0x%x".format(ba.fromOctets())}")
}
}</lang>
{{out}}
<pre>
0x7f -> 0x7f <- 0x7f
0x3fff -> 0xff 0x7f <- 0x3fff
0x200000 -> 0x81 0x80 0x80 0x00 <- 0x200000
0x1fffff -> 0xff 0xff 0x7f <- 0x1fffff
</pre>
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